Detecting Local Earthquakes in a Noisy Continental Margin Environment

在嘈杂的大陆边缘环境中检测局部地震

• 批准号: 1049682
• 负责人: Anne Tréhu
• 金额: $ 10.4万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-02-15 至 2013-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1049682&HistoricalAwards=false
• 关键词: Detecting; Local; Earthquakes; Noisy; Continental

Assessing earthquake risk due to seismicity along the Cascadia margin from northern California to southern British Columbia is a matter of great public interest. Studies of regional seismicity recorded by arrays of seismographs are a primary tool for this purpose, but to date such studies have been largely limited to onshore arrays. In the upcoming Cascadia project, onshore instrumentation will be complemented by deployments of 60 or more Ocean Bottom Seismographs (OBS) off the Cascadia coast for several years. A modest deployment of OBSs off the Oregon coast in 2007-2009 has demonstrated the great difficulty of separating relevant seismic events in OBS data from impulsive signals of probable biological origin. This project seeks to develop computer automated methods for separating seismic signals from extraneous signals in the OBS data, particularly for instruments located in shallow water near the coast. The project has a number of broader impacts, but by far the most significant is the very high societal relevance of developing these techniques for studies of seismicity and seismic hazards in general, and for the Cascadia project in particular.

从北加州到南部不列颠哥伦比亚省的卡斯卡迪亚利润率沿着卡斯卡迪亚边缘沿线的地震风险评估地震风险是极大的公共利益。关于此目的的阵列阵列记录的区域地震性的研究是一个主要工具，但是迄今为止，此类研究在很大程度上仅限于陆上阵列。在即将到来的Cascadia项目中，陆上仪器将通过在卡斯卡迪亚海岸附近的60或更多海洋底部地震仪（OBS）部署来补充。 2007 - 2009年在俄勒冈州海岸外的OBSS的适度部署表明，在可能的生物学起源的冲动信号中将相关的地震事件分离出相关的地震事件非常困难。该项目旨在开发计算机自动化方法，以将地震信号与OBS数据中的无关信号分开，特别是对于位于海岸附近浅水中的仪器。该项目具有更广泛的影响，但到目前为止，最重要的是开发这些技术以进行地震性和地震危害的研究，尤其是Cascadia项目的非常高的社会意义。